Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 453, Issue 1, Pages 29-37Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stv1470
Keywords
galaxies: haloes; cosmology: theory; dark matter
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Funding
- NASA through Hubble Space Telescope [HST-GO-12966.003-A, HST-GO-13343.009-A]
- National Science Foundation [ACI-1053575]
- Division Of Physics
- Direct For Mathematical & Physical Scien [1520921] Funding Source: National Science Foundation
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We investigate the effect of self-interacting dark matter (SIDM) on the density profiles of V-max similar or equal to 40km s(-1) isolated dwarf dark matter haloes - the scale of relevance for the too big to fail problem (TBTF) - using very high resolution cosmological zoom simulations. Each halo has millions of particles within its virial radius. We find that SIDM models with cross-sections per unit mass spanning the range sigma/m = 0.5-50 cm(2) g(-1) alleviate TBTF and produce constant-density cores of size 300-1000 pc, comparable to the half-light radii of M-star similar to 10(5-7)M(circle dot) dwarfs. The largest, lowest density cores develop for cross-sections in the middle of this range, sigma/m similar to 5-10 cm(2) g(-1). Our largest SIDM cross-section run (sigma/m = 50 cm(2) g(-1)) develops a slightly denser core owing to mild core-collapse behaviour, but it remains less dense than the cold dark matter case and retains a constant-density core profile. Our work suggests that SIDM cross-sections as large or larger than 50 cm(2) g(-1) remain viable on velocity scales of dwarf galaxies (v(rms) similar to 40 km s(-1)). The range of SIDM cross-sections that alleviate TBTF and the cusp/core problem spans at least two orders of magnitude and therefore need not be particularly fine-tuned.
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